KR20150032686A

KR20150032686A - Device for guiding impeller suction of centrifugal pump

Info

Publication number: KR20150032686A
Application number: KR20150032312A
Authority: KR
Inventors: 서형석; 장호윤
Original assignee: 재단법인 중소조선연구원
Priority date: 2015-03-09
Filing date: 2015-03-09
Publication date: 2015-03-27

Abstract

The present invention relates to an impeller suction guide device for a centrifugal pump, which comprises a pump housing having a space therein, an impeller eccentrically housed in the pump housing, a guide vane covering the impeller in the circumferential direction, A suction pipe communicated in the axial direction of the pump housing, and a discharge pipe connected to a part of the circumference of the pump housing, the centrifugal pump comprising: Wherein the suction pipe is formed with a spiral groove in an inner diameter thereof so that fluid supplied to the impeller is swirled and supplied in a rotating direction of the impeller.
According to the present invention, the generation of cavitation due to collision with the impeller when the fluid is sucked through the fluid intake guide having a simple structure is suppressed, thereby minimizing the erosion of the impeller, thereby extending the service life.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an impeller suction guide device for a centrifugal pump,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impeller suction guide device for a centrifugal pump, and more particularly, to an impeller suction guide device for an centrifugal pump improved in life by minimizing erosion of an impeller used in a centrifugal pump.

As is well known, a centrifugal pump is a pump configured to discharge the fluid sucked into the impeller in the direction of the flow perpendicular to the axis, and is also referred to as a return pump.

Therefore, the fluid that has entered the center of the centrifugal pump flows through the rotating impeller to the outer circumference in a state where the pressure is increased, and is discharged through the pump outlet through the spiral guide vane, so that the suction flow path and the discharge flow path are perpendicular Respectively.

There are numerous prior arts related to such centrifugal pumps, but many of them have been mainly improved in order to improve the suction efficiency, for example, as disclosed in Patent Publication No. 0819139, Publication No. 2008-0082697, Utility Model Registration Bulletin 1990-0010009, and the like.

As described above, the centrifugal pump is a centrifugal pump in which the fluid flows through the impeller that transmits the power of the motor to the fluid, and the flow of the fluid, which is discharged through the discharge port by the centrifugal force, Structure.

Therefore, cavitation occurs when the flow direction changes at almost right angles as the fluid enters the impeller at the suction port portion. This cavitation eventually increases the erosion of the impeller and shortens the useful life of the impeller .

However, as shown in the prior art, efforts to reduce such cavitation have been insufficient. One of the things disclosed is that the structure of the centrifugal pump itself is completely improved. In this case, since the pump itself needs to be redesigned, And the pump's ability to change the pump's ability to change, simply changing the pump structure itself can not completely replace the existing centrifugal pump is encountered.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems in the prior art, and it is an object of the present invention to provide a very simple guide means while using the structure of a conventional centrifugal pump as it is and minimizing cavitation phenomenon without changing the structure of a conventional pump, The impeller suction guide device of the centrifugal pump is provided, which can extend the service life of the pump by preventing erosion of the impeller.

According to the present invention, there is provided a pump housing having a space therein, an impeller eccentrically installed in the pump housing, a guide vane covering the impeller in a circumferential direction, A suction pipe communicated in an axial direction, and a discharge pipe connected to a part of the periphery of the pump housing, the centrifugal pump comprising: Wherein the suction pipe is formed with a spiral groove in an inner diameter thereof so that fluid supplied to the impeller is swirled and supplied in a rotating direction of the impeller.

At this time, the helical grooves are configured to maintain a finer pitch toward the outlet, which is the side adjacent to the impeller, from the inlet of the suction pipe. When the impeller is discharged to the impeller, the helical grooves are pivotally provided corresponding to the rotational speed of the impeller.

In addition, the helical groove is inclined so as to correspond to the shape of the side surface of the impeller, and the helical groove is also characterized in that the width is widened in the depth direction.

According to the present invention, the generation of cavitation due to collision with the impeller when the fluid is sucked through the fluid intake guide having a simple structure is suppressed, thereby minimizing the erosion of the impeller, thereby extending the service life.

1 is a schematic diagram showing the outline of a centrifugal pump according to the present invention.
FIG. 2 is a view showing an example in which the centrifugal pump according to the present invention is cut in the longitudinal direction and a suction pipe is attached.
3 is an exemplary perspective view of a centrifugal pump according to the present invention in a longitudinal direction.
4 is a structural view for explaining an example of using a centrifugal pump according to the present invention.
FIG. 5 is an illustration showing an example of fluid inhalation of a centrifugal pump according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Before describing the present invention, the following specific structural or functional descriptions are merely illustrative for the purpose of describing an embodiment according to the concept of the present invention, and embodiments according to the concept of the present invention may be embodied in various forms, And should not be construed as limited to the embodiments described herein.

In addition, since the embodiments according to the concept of the present invention can make various changes and have various forms, specific embodiments are illustrated in the drawings and described in detail herein. However, it should be understood that the embodiments according to the concept of the present invention are not intended to limit the present invention to specific modes of operation, but include all modifications, equivalents and alternatives falling within the spirit and scope of the present invention.

1 to 5, the centrifugal pump according to the present invention includes a pump housing 100.

The pump housing 100 may be regarded as a kind of swirl pipe which guides the swirl in the inside of the pump housing.

A drive motor (not shown) is installed on one side of the pump housing 100.

In addition, an impeller 120 connected to the motor shaft of the motor (not shown) is installed inside the pump housing 100.

The impeller 120 is composed of a plurality of blades that draw a helical form in the circumferential direction from the center of the circle, and is configured to discharge the fluid at a high speed by scattering the fluid by the centrifugal force in the rotating direction.

At this time, the impeller 120 is eccentrically installed in the pump housing 100, and a guide vane 110 is installed in the circumferential direction of the impeller 120.

The guide vane 110 is for compressing and discharging the fluid by the rotational force of the impeller 120.

A discharge pipe 140 is connected to one side of the pump housing 100 in the circumferential direction and a suction pipe 130 is connected to one side of the pump housing 100 so as to communicate with the center of the impeller 120.

The fluid sucked vertically into the impeller 120 through the suction pipe 130 is vertically rotated while rotating in the circumferential direction of the impeller 120 and then compressed through the guide vane 110 to be discharged to the discharge pipe 140. [ And then discharged at a high speed and high pressure.

The present invention has the greatest feature in that the centrifugal pump having such a conventional structure does not cause any cavitation phenomenon around the impeller 120 without changing its structure at all.

To this end, in the present invention, a helical groove 132 is formed on the inner circumferential surface of the suction pipe 130.

4, the helical groove 132 is recessed along the inner diameter of the suction pipe 130 in a number corresponding to the spiral of the impeller 120.

In particular, the spiral grooves 132 are spaced apart from the impeller 120 by a distance between the spiral grooves 132 at a long distance, and should be formed closer to the impeller 120.

In other words, the pitch of the helical groove 132 gradually becomes closer from the inlet of the suction pipe 130 toward the outlet of the suction pipe 130 because the fluid to be sucked takes into account the rotational speed of the impeller 120 At the final outlet, to be discharged toward the impeller 120 while rotating at a high speed.

This allows the fluid to be sucked into the impeller 120 as if it were a venturi structure, which is completely different from the conventional structure inhaled by collision.

Accordingly, since the rotation of the impeller 120 and the suction flow (behavior) of the fluid are sucked through the flow rotating in the spiral direction as shown by the arrows, the rotation gap can be reduced, which has the effect of suppressing the generation of cavitation .

As a result, since the cavitation is minimized, erosion at the surface where the impeller 120 and the fluid collide with each other is prevented, so that the life of the impeller 120 can be prolonged.

In particular, the helical grooves 132 are formed in a slanting line corresponding to a side cross-sectional shape of the impeller, and are formed so as to have a wider width in the depth direction, so that the flow of the fluid is smoothly guided.

Of course, although it may be a 'V' shape or a semicircular shape in some cases, it is necessary to minimize the flow shock during suction flow on the side adjacent to the impeller 120 by satisfying the above shape, and to suppress cavitation.

5, the suction flow of the fluid sucked through the suction pipe 130 is gradually increased along the spiral groove 132, and the flow rate of the impeller 120 is increased almost in the vicinity of the impeller 120, Which is similar to the rotation speed of the rotor.

The suction fluid is sucked while being sucked smoothly in a state in which there is little collision impact with the impeller 120. The sucked fluid is rotationally compressed with the guide vane 110 and swirls on the outermost inside of the pump housing 100 And discharged at a high pressure and a high pressure toward the discharge pipe 140.

The suction pipe 130 for inducing such a behavior must have a certain length. The suction pipe 130 has a length longer than the rotation radius of the impeller 120 so as to be sucked at a flow rate comparable to the rotational speed of the impeller 120 in the vicinity of the impeller 120 Should be formed.

As described above, according to the present invention, only the length of the suction pipe 130 is adjusted without changing the structure of the conventional centrifugal pump and the spiral groove 132 having a specific shape is formed in the inner diameter, It is possible to prevent cavitation generated on the surface of the impeller 120 and to prevent erosion on the surface of the impeller 120.

100: pump housing 110: guide vane
120: impeller 130: suction pipe
140: discharge pipe

Claims

A pump housing having a space therein, an impeller eccentrically housed in the pump housing, a guide vane covering the impeller in the circumferential direction, a suction pipe connected to one side of the pump housing and communicated with the axial direction of the impeller, A centrifugal pump connected to the discharge pipe;
Wherein the suction pipe is formed with a spiral groove in its inner diameter so that the fluid supplied to the impeller is swirled and supplied in the rotating direction of the impeller.

The method of claim 1,
Wherein the helical groove is formed so as to maintain a finer pitch from the inlet of the suction pipe toward the outlet which is the side adjacent to the impeller and is pivotally supplied in correspondence with the rotational speed of the impeller when the impeller is discharged to the impeller. .

The method of claim 1,
Wherein the spiral groove is shaped obliquely so as to correspond to a side cross-sectional shape of the impeller, and has a shape that is widened in the depth direction.